I'm not certain of James Wood's specific analysis. But he may have analyzed how 'Pulp Fiction' subverts traditional storytelling. For example, it doesn't follow a typical beginning - middle - end structure.
I don't have the exact summary of James Wood's analysis on 'Pulp Fiction'. However, he could potentially look at the character development in the movie. In 'Pulp Fiction', the characters change and grow in unexpected ways. For instance, Jules' transformation throughout the story is quite remarkable. Wood may also analyze the film's use of symbolism, like the briefcase which is never fully explained but holds a great deal of mystery and importance in the film.